变速器的齿轮轮齿修形及其控制

随着汽车工业的发展及齿轮传动的研究和齿轮制造技术水平的不断提高,齿轮轮齿的修形技术有了很大发展,通过齿轮轮齿的修形明显改善了齿轮传动的平稳性,降低了齿轮的噪声和振动,延长了齿轮的使用寿命。本文着重通过对剃齿工序的修形和利用Ｋ框图的控制,达到降低噪音的目的。     

工地定型化施工道路研究与应用

传统工地临时道路施工资源浪费严重,而工地定型化施工道路具有成本低、工期短、环保、可循环利用等优点,并且符合绿色施工的要求.结合工程实例,对工地定型化施工道路进行详细介绍,包括施工工艺、施工流程、关键技术点等,并进行相应的经济效益分析.结果表明,工地定型化施工道路技术措施先进,工艺简单,具有良好的社会和经济效益.     

A mathematical morphological approach for region of interest coding of microscopy image compression

A novel mathematical morphological approach for region of interest(ROI) automatic determination and JPEG2000-based coding of microscopy image compression is presented.The algorithm is very fast and requires lower computing power,which is particularly suitable for some irregular region-based cell microscopy images with poor qualities.Firstly,an active threshold-based method is discussed to create a rough mask of regions of interest(cells).And then some morphological operations are designed and applied to achieve the segmentation of cells.In addition,an extra morphological operation,dilation,is applied to create the final mask with some redundancies to avoid the"edge effect"after removing false cells.Finally,ROI and region of background(ROB) are obtained and encoded individually in different compression ratio flexibly based on the JPEG2000,which can adjust the quality between ROI and ROB without coding for ROI shape.The experimental results certify the effectiveness of the proposed algorithm,and compared with JPEG2000,the proposed algorithm has better performance in both subjective quality and objective quality at the same compression ratios.